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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: 8; c-basic-offset: 8 -*- */
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* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
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* This file is part of the Gnome Library.
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* The Gnome Library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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* The Gnome Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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* You should have received a copy of the GNU Library General Public
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* License along with the Gnome Library; see the file COPYING.LIB. If not,
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* write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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/* GnomeCanvas widget - Tk-like canvas widget for Gnome
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* GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas
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* widget. Tk is copyrighted by the Regents of the University of California,
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* Sun Microsystems, and other parties.
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* Authors: Federico Mena <federico@nuclecu.unam.mx>
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* Raph Levien <raph@gimp.org>
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#ifndef GNOME_CANVAS_H
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#define GNOME_CANVAS_H
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#include <gtk/gtklayout.h>
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#include <libart_lgpl/art_misc.h>
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#include <libart_lgpl/art_rect.h>
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#include <libart_lgpl/art_svp.h>
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#include <libart_lgpl/art_uta.h>
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#include <libart_lgpl/art_affine.h>
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/* "Small" value used by canvas stuff */
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#define GNOME_CANVAS_EPSILON 1e-10
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/* Macros for building colors that fit in a 32-bit integer. The values are in
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#define GNOME_CANVAS_COLOR(r, g, b) ((((int) (r) & 0xff) << 24) \
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| (((int) (g) & 0xff) << 16) \
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| (((int) (b) & 0xff) << 8) \
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#define GNOME_CANVAS_COLOR_A(r, g, b, a) ((((int) (r) & 0xff) << 24) \
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| (((int) (g) & 0xff) << 16) \
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| (((int) (b) & 0xff) << 8) \
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typedef struct _GnomeCanvas GnomeCanvas;
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typedef struct _GnomeCanvasClass GnomeCanvasClass;
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typedef struct _GnomeCanvasItem GnomeCanvasItem;
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typedef struct _GnomeCanvasItemClass GnomeCanvasItemClass;
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typedef struct _GnomeCanvasGroup GnomeCanvasGroup;
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typedef struct _GnomeCanvasGroupClass GnomeCanvasGroupClass;
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/* GnomeCanvasItem - base item class for canvas items
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* All canvas items are derived from GnomeCanvasItem. The only information a
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* GnomeCanvasItem contains is its parent canvas, its parent canvas item group,
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* its bounding box in world coordinates, and its current affine transformation.
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* Items inside a canvas are organized in a tree of GnomeCanvasItemGroup nodes
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* and GnomeCanvasItem leaves. Each canvas has a single root group, which can
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* be obtained with the gnome_canvas_get_root() function.
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* The abstract GnomeCanvasItem class does not have any configurable or
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* queryable attributes.
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/* Object flags for items */
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GNOME_CANVAS_ITEM_REALIZED = 1 << 4,
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GNOME_CANVAS_ITEM_MAPPED = 1 << 5,
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GNOME_CANVAS_ITEM_ALWAYS_REDRAW = 1 << 6,
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GNOME_CANVAS_ITEM_VISIBLE = 1 << 7,
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GNOME_CANVAS_ITEM_NEED_UPDATE = 1 << 8,
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GNOME_CANVAS_ITEM_NEED_AFFINE = 1 << 9,
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GNOME_CANVAS_ITEM_NEED_CLIP = 1 << 10,
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GNOME_CANVAS_ITEM_NEED_VIS = 1 << 11,
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GNOME_CANVAS_ITEM_AFFINE_FULL = 1 << 12
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/* Update flags for items */
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GNOME_CANVAS_UPDATE_REQUESTED = 1 << 0,
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GNOME_CANVAS_UPDATE_AFFINE = 1 << 1,
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GNOME_CANVAS_UPDATE_CLIP = 1 << 2,
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GNOME_CANVAS_UPDATE_VISIBILITY = 1 << 3,
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GNOME_CANVAS_UPDATE_IS_VISIBLE = 1 << 4 /* Deprecated. FIXME: remove this */
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/* Data for rendering in antialiased mode */
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/* 24-bit RGB buffer for rendering */
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/* Rectangle describing the rendering area */
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/* Rowstride for the buffer */
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/* Background color, given as 0xrrggbb */
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/* Invariant: at least one of the following flags is true. */
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/* Set when the render rectangle area is the solid color bg_color */
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unsigned int is_bg : 1;
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/* Set when the render rectangle area is represented by the buf */
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unsigned int is_buf : 1;
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#define GNOME_TYPE_CANVAS_ITEM (gnome_canvas_item_get_type ())
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#define GNOME_CANVAS_ITEM(obj) (GTK_CHECK_CAST ((obj), GNOME_TYPE_CANVAS_ITEM, GnomeCanvasItem))
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#define GNOME_CANVAS_ITEM_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GNOME_TYPE_CANVAS_ITEM, GnomeCanvasItemClass))
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#define GNOME_IS_CANVAS_ITEM(obj) (GTK_CHECK_TYPE ((obj), GNOME_TYPE_CANVAS_ITEM))
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#define GNOME_IS_CANVAS_ITEM_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GNOME_TYPE_CANVAS_ITEM))
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#define GNOME_CANVAS_ITEM_GET_CLASS(obj) (GTK_CHECK_GET_CLASS ((obj), GNOME_TYPE_CANVAS_ITEM, GnomeCanvasItemClass))
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struct _GnomeCanvasItem {
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/* Parent canvas for this item */
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/* Parent canvas group for this item (a GnomeCanvasGroup) */
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GnomeCanvasItem *parent;
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/* If NULL, assumed to be the identity tranform. If flags does not have
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* AFFINE_FULL, then a two-element array containing a translation. If
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* flags contains AFFINE_FULL, a six-element array containing an affine
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/* Bounding box for this item (in canvas coordinates) */
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double x1, y1, x2, y2;
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struct _GnomeCanvasItemClass {
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GtkObjectClass parent_class;
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/* Tell the item to update itself. The flags are from the update flags
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* defined above. The item should update its internal state from its
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* queued state, and recompute and request its repaint area. The
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* affine, if used, is a pointer to a 6-element array of doubles. The
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* update method also recomputes the bounding box of the item.
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void (* update) (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags);
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/* Realize an item -- create GCs, etc. */
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void (* realize) (GnomeCanvasItem *item);
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/* Unrealize an item */
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void (* unrealize) (GnomeCanvasItem *item);
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/* Map an item - normally only need by items with their own GdkWindows */
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void (* map) (GnomeCanvasItem *item);
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void (* unmap) (GnomeCanvasItem *item);
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/* Return the microtile coverage of the item */
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ArtUta *(* coverage) (GnomeCanvasItem *item);
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/* Draw an item of this type. (x, y) are the upper-left canvas pixel
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* coordinates of the drawable, a temporary pixmap, where things get
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* drawn. (width, height) are the dimensions of the drawable.
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void (* draw) (GnomeCanvasItem *item, GdkDrawable *drawable,
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int x, int y, int width, int height);
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/* Render the item over the buffer given. The buf data structure
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* contains both a pointer to a packed 24-bit RGB array, and the
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* coordinates. This method is only used for antialiased canvases.
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* TODO: figure out where clip paths fit into the rendering framework.
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void (* render) (GnomeCanvasItem *item, GnomeCanvasBuf *buf);
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/* Calculate the distance from an item to the specified point. It also
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* returns a canvas item which is the item itself in the case of the
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* object being an actual leaf item, or a child in case of the object
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* being a canvas group. (cx, cy) are the canvas pixel coordinates that
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* correspond to the item-relative coordinates (x, y).
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double (* point) (GnomeCanvasItem *item, double x, double y, int cx, int cy,
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GnomeCanvasItem **actual_item);
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/* Fetch the item's bounding box (need not be exactly tight). This
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* should be in item-relative coordinates.
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void (* bounds) (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2);
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/* Signal: an event ocurred for an item of this type. The (x, y)
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* coordinates are in the canvas world coordinate system.
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gboolean (* event) (GnomeCanvasItem *item, GdkEvent *event);
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/* Reserved for future expansion */
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gpointer spare_vmethods [4];
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GType gnome_canvas_item_get_type (void) G_GNUC_CONST;
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/* Create a canvas item using the standard Gtk argument mechanism. The item is
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* automatically inserted at the top of the specified canvas group. The last
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* argument must be a NULL pointer.
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GnomeCanvasItem *gnome_canvas_item_new (GnomeCanvasGroup *parent, GType type,
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const gchar *first_arg_name, ...);
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/* Constructors for use in derived classes and language wrappers */
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void gnome_canvas_item_construct (GnomeCanvasItem *item, GnomeCanvasGroup *parent,
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const gchar *first_arg_name, va_list args);
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/* Configure an item using the standard Gtk argument mechanism. The last
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* argument must be a NULL pointer.
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void gnome_canvas_item_set (GnomeCanvasItem *item, const gchar *first_arg_name, ...);
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/* Used only for language wrappers and the like */
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void gnome_canvas_item_set_valist (GnomeCanvasItem *item,
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const gchar *first_arg_name, va_list args);
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/* Move an item by the specified amount */
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void gnome_canvas_item_move (GnomeCanvasItem *item, double dx, double dy);
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/* Apply a relative affine transformation to the item. */
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void gnome_canvas_item_affine_relative (GnomeCanvasItem *item, const double affine[6]);
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/* Apply an absolute affine transformation to the item. */
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void gnome_canvas_item_affine_absolute (GnomeCanvasItem *item, const double affine[6]);
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/* Raise an item in the z-order of its parent group by the specified number of
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void gnome_canvas_item_raise (GnomeCanvasItem *item, int positions);
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/* Lower an item in the z-order of its parent group by the specified number of
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void gnome_canvas_item_lower (GnomeCanvasItem *item, int positions);
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/* Raise an item to the top of its parent group's z-order. */
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void gnome_canvas_item_raise_to_top (GnomeCanvasItem *item);
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/* Lower an item to the bottom of its parent group's z-order */
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void gnome_canvas_item_lower_to_bottom (GnomeCanvasItem *item);
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/* Show an item (make it visible). If the item is already shown, it has no
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void gnome_canvas_item_show (GnomeCanvasItem *item);
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/* Hide an item (make it invisible). If the item is already invisible, it has
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void gnome_canvas_item_hide (GnomeCanvasItem *item);
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/* Grab the mouse for the specified item. Only the events in event_mask will be
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* reported. If cursor is non-NULL, it will be used during the duration of the
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* grab. Time is a proper X event time parameter. Returns the same values as
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int gnome_canvas_item_grab (GnomeCanvasItem *item, unsigned int event_mask,
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GdkCursor *cursor, guint32 etime);
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/* Ungrabs the mouse -- the specified item must be the same that was passed to
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* gnome_canvas_item_grab(). Time is a proper X event time parameter.
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void gnome_canvas_item_ungrab (GnomeCanvasItem *item, guint32 etime);
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/* These functions convert from a coordinate system to another. "w" is world
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* coordinates and "i" is item coordinates.
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void gnome_canvas_item_w2i (GnomeCanvasItem *item, double *x, double *y);
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void gnome_canvas_item_i2w (GnomeCanvasItem *item, double *x, double *y);
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/* Gets the affine transform that converts from item-relative coordinates to
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void gnome_canvas_item_i2w_affine (GnomeCanvasItem *item, double affine[6]);
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/* Gets the affine transform that converts from item-relative coordinates to
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* canvas pixel coordinates.
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void gnome_canvas_item_i2c_affine (GnomeCanvasItem *item, double affine[6]);
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/* Remove the item from its parent group and make the new group its parent. The
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* item will be put on top of all the items in the new group. The item's
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* coordinates relative to its new parent to *not* change -- this means that the
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* item could potentially move on the screen.
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* The item and the group must be in the same canvas. An item cannot be
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* reparented to a group that is the item itself or that is an inferior of the
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void gnome_canvas_item_reparent (GnomeCanvasItem *item, GnomeCanvasGroup *new_group);
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/* Used to send all of the keystroke events to a specific item as well as
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* GDK_FOCUS_CHANGE events.
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void gnome_canvas_item_grab_focus (GnomeCanvasItem *item);
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/* Fetch the bounding box of the item. The bounding box may not be exactly
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* tight, but the canvas items will do the best they can. The returned bounding
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* box is in the coordinate system of the item's parent.
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void gnome_canvas_item_get_bounds (GnomeCanvasItem *item,
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double *x1, double *y1, double *x2, double *y2);
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/* Request that the update method eventually get called. This should be used
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* only by item implementations.
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void gnome_canvas_item_request_update (GnomeCanvasItem *item);
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/* GnomeCanvasGroup - a group of canvas items
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* A group is a node in the hierarchical tree of groups/items inside a canvas.
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* Groups serve to give a logical structure to the items.
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* Consider a circuit editor application that uses the canvas for its schematic
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* display. Hierarchically, there would be canvas groups that contain all the
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* components needed for an "adder", for example -- this includes some logic
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* gates as well as wires. You can move stuff around in a convenient way by
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* doing a gnome_canvas_item_move() of the hierarchical groups -- to move an
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* adder, simply move the group that represents the adder.
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* The following arguments are available:
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* name type read/write description
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* --------------------------------------------------------------------------------
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* x double RW X coordinate of group's origin
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* y double RW Y coordinate of group's origin
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#define GNOME_TYPE_CANVAS_GROUP (gnome_canvas_group_get_type ())
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#define GNOME_CANVAS_GROUP(obj) (GTK_CHECK_CAST ((obj), GNOME_TYPE_CANVAS_GROUP, GnomeCanvasGroup))
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#define GNOME_CANVAS_GROUP_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GNOME_TYPE_CANVAS_GROUP, GnomeCanvasGroupClass))
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#define GNOME_IS_CANVAS_GROUP(obj) (GTK_CHECK_TYPE ((obj), GNOME_TYPE_CANVAS_GROUP))
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#define GNOME_IS_CANVAS_GROUP_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GNOME_TYPE_CANVAS_GROUP))
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#define GNOME_CANVAS_GROUP_GET_CLASS(obj) (GTK_CHECK_GET_CLASS ((obj), GNOME_TYPE_CANVAS_GROUP, GnomeCanvasGroupClass))
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struct _GnomeCanvasGroup {
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GnomeCanvasItem item;
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/* Children of the group */
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GList *item_list_end;
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struct _GnomeCanvasGroupClass {
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GnomeCanvasItemClass parent_class;
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GType gnome_canvas_group_get_type (void) G_GNUC_CONST;
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/*** GnomeCanvas ***/
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#define GNOME_TYPE_CANVAS (gnome_canvas_get_type ())
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#define GNOME_CANVAS(obj) (GTK_CHECK_CAST ((obj), GNOME_TYPE_CANVAS, GnomeCanvas))
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#define GNOME_CANVAS_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GNOME_TYPE_CANVAS, GnomeCanvasClass))
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#define GNOME_IS_CANVAS(obj) (GTK_CHECK_TYPE ((obj), GNOME_TYPE_CANVAS))
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#define GNOME_IS_CANVAS_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GNOME_TYPE_CANVAS))
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#define GNOME_CANVAS_GET_CLASS(obj) (GTK_CHECK_GET_CLASS ((obj), GNOME_TYPE_CANVAS, GnomeCanvasClass))
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struct _GnomeCanvas {
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/* Root canvas group */
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GnomeCanvasItem *root;
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/* Area that needs redrawing, stored as a microtile array */
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/* The item containing the mouse pointer, or NULL if none */
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GnomeCanvasItem *current_item;
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/* Item that is about to become current (used to track deletions and such) */
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GnomeCanvasItem *new_current_item;
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/* Item that holds a pointer grab, or NULL if none */
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GnomeCanvasItem *grabbed_item;
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/* If non-NULL, the currently focused item */
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GnomeCanvasItem *focused_item;
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/* GC for temporary draw pixmap */
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/* Event on which selection of current item is based */
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/* Scrolling region */
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double scroll_x1, scroll_y1;
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double scroll_x2, scroll_y2;
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/* Scaling factor to be used for display */
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double pixels_per_unit;
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/* Idle handler ID */
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/* Signal handler ID for destruction of the root item */
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guint root_destroy_id;
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/* Area that is being redrawn. Contains (x1, y1) but not (x2, y2).
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* Specified in canvas pixel coordinates.
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int redraw_x1, redraw_y1;
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int redraw_x2, redraw_y2;
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/* Offsets of the temprary drawing pixmap */
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int draw_xofs, draw_yofs;
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/* Internal pixel offsets when zoomed out */
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int zoom_xofs, zoom_yofs;
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/* Last known modifier state, for deferred repick when a button is down */
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/* Event mask specified when grabbing an item */
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guint grabbed_event_mask;
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/* Tolerance distance for picking items */
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/* Whether the canvas should center the scroll region in the middle of
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* the window if the scroll region is smaller than the window.
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unsigned int center_scroll_region : 1;
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/* Whether items need update at next idle loop iteration */
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unsigned int need_update : 1;
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/* Whether the canvas needs redrawing at the next idle loop iteration */
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unsigned int need_redraw : 1;
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/* Whether current item will be repicked at next idle loop iteration */
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unsigned int need_repick : 1;
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/* For use by internal pick_current_item() function */
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unsigned int left_grabbed_item : 1;
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/* For use by internal pick_current_item() function */
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unsigned int in_repick : 1;
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/* Whether the canvas is in antialiased mode or not */
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/* Which dither mode to use for antialiased mode drawing */
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struct _GnomeCanvasClass {
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GtkLayoutClass parent_class;
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/* Draw the background for the area given. This method is only used
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* for non-antialiased canvases.
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void (* draw_background) (GnomeCanvas *canvas, GdkDrawable *drawable,
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int x, int y, int width, int height);
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/* Render the background for the buffer given. The buf data structure
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* contains both a pointer to a packed 24-bit RGB array, and the
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* coordinates. This method is only used for antialiased canvases.
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void (* render_background) (GnomeCanvas *canvas, GnomeCanvasBuf *buf);
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/* Private Virtual methods for groping the canvas inside bonobo */
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void (* request_update) (GnomeCanvas *canvas);
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/* Reserved for future expansion */
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gpointer spare_vmethods [4];
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GType gnome_canvas_get_type (void) G_GNUC_CONST;
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/* Creates a new canvas. You should check that the canvas is created with the
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* proper visual and colormap. Any visual will do unless you intend to insert
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* gdk_imlib images into it, in which case you should use the gdk_imlib visual.
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* You should call gnome_canvas_set_scroll_region() soon after calling this
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* function to set the desired scrolling limits for the canvas.
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GtkWidget *gnome_canvas_new (void);
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/* Creates a new antialiased empty canvas. You should push the GdkRgb colormap
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* and visual for this.
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#ifndef GNOME_EXCLUDE_EXPERIMENTAL
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GtkWidget *gnome_canvas_new_aa (void);
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/* Returns the root canvas item group of the canvas */
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GnomeCanvasGroup *gnome_canvas_root (GnomeCanvas *canvas);
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/* Sets the limits of the scrolling region, in world coordinates */
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void gnome_canvas_set_scroll_region (GnomeCanvas *canvas,
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double x1, double y1, double x2, double y2);
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/* Gets the limits of the scrolling region, in world coordinates */
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void gnome_canvas_get_scroll_region (GnomeCanvas *canvas,
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double *x1, double *y1, double *x2, double *y2);
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/* Whether the canvas centers the scroll region if it is smaller than the window */
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void gnome_canvas_set_center_scroll_region (GnomeCanvas *canvas, gboolean center_scroll_region);
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/* Returns whether the canvas is set to center the scroll region if it is smaller than the window */
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gboolean gnome_canvas_get_center_scroll_region (GnomeCanvas *canvas);
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/* Sets the number of pixels that correspond to one unit in world coordinates */
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void gnome_canvas_set_pixels_per_unit (GnomeCanvas *canvas, double n);
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/* Scrolls the canvas to the specified offsets, given in canvas pixel coordinates */
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void gnome_canvas_scroll_to (GnomeCanvas *canvas, int cx, int cy);
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/* Returns the scroll offsets of the canvas in canvas pixel coordinates. You
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* can specify NULL for any of the values, in which case that value will not be
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void gnome_canvas_get_scroll_offsets (GnomeCanvas *canvas, int *cx, int *cy);
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/* Requests that the canvas be repainted immediately instead of in the idle
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void gnome_canvas_update_now (GnomeCanvas *canvas);
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/* Returns the item that is at the specified position in world coordinates, or
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* NULL if no item is there.
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GnomeCanvasItem *gnome_canvas_get_item_at (GnomeCanvas *canvas, double x, double y);
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/* For use only by item type implementations. Request that the canvas eventually
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* redraw the specified region. The region is specified as a microtile
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* array. This function takes over responsibility for freeing the uta argument.
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void gnome_canvas_request_redraw_uta (GnomeCanvas *canvas, ArtUta *uta);
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/* For use only by item type implementations. Request that the canvas
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* eventually redraw the specified region, specified in canvas pixel
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* coordinates. The region contains (x1, y1) but not (x2, y2).
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void gnome_canvas_request_redraw (GnomeCanvas *canvas, int x1, int y1, int x2, int y2);
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/* Gets the affine transform that converts world coordinates into canvas pixel
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void gnome_canvas_w2c_affine (GnomeCanvas *canvas, double affine[6]);
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/* These functions convert from a coordinate system to another. "w" is world
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* coordinates, "c" is canvas pixel coordinates (pixel coordinates that are
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* (0,0) for the upper-left scrolling limit and something else for the
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* lower-left scrolling limit).
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void gnome_canvas_w2c (GnomeCanvas *canvas, double wx, double wy, int *cx, int *cy);
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void gnome_canvas_w2c_d (GnomeCanvas *canvas, double wx, double wy, double *cx, double *cy);
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void gnome_canvas_c2w (GnomeCanvas *canvas, int cx, int cy, double *wx, double *wy);
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/* This function takes in coordinates relative to the GTK_LAYOUT
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* (canvas)->bin_window and converts them to world coordinates.
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void gnome_canvas_window_to_world (GnomeCanvas *canvas,
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double winx, double winy, double *worldx, double *worldy);
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/* This is the inverse of gnome_canvas_window_to_world() */
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void gnome_canvas_world_to_window (GnomeCanvas *canvas,
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double worldx, double worldy, double *winx, double *winy);
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/* Takes a string specification for a color and allocates it into the specified
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* GdkColor. If the string is null, then it returns FALSE. Otherwise, it
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int gnome_canvas_get_color (GnomeCanvas *canvas, const char *spec, GdkColor *color);
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/* Allocates a color from the RGB value passed into this function. */
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gulong gnome_canvas_get_color_pixel (GnomeCanvas *canvas,
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/* Sets the stipple origin of the specified gc so that it will be aligned with
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* all the stipples used in the specified canvas. This is intended for use only
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* by canvas item implementations.
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void gnome_canvas_set_stipple_origin (GnomeCanvas *canvas, GdkGC *gc);
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/* Controls the dithering used when the canvas renders.
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* Only applicable to antialiased canvases - ignored by non-antialiased canvases.
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void gnome_canvas_set_dither (GnomeCanvas *canvas, GdkRgbDither dither);
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/* Returns the dither mode of an antialiased canvas.
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* Only applicable to antialiased canvases - ignored by non-antialiased canvases.
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GdkRgbDither gnome_canvas_get_dither (GnomeCanvas *canvas);
added
removed
libgnomecanvas/gnome-canvas.h
